NPE when performing integration.

I got the following error after it was working, without changes, on the previous job. I believe I re-ran the job and this time there were no changes on the branch. Not sure if this has something to do with it.

ERROR: Publisher jenkins.plugins.svnmerge.IntegrationPublisher aborted due to exception
java.lang.NullPointerException
at org.tmatesoft.svn.core.SVNException.<init>(SVNException.java:50)
at org.tmatesoft.svn.core.SVNException.<init>(SVNException.java:37)
at jenkins.plugins.svnmerge.FeatureBranchProperty$2.invoke(FeatureBranchProperty.java:273)
at jenkins.plugins.svnmerge.FeatureBranchProperty$2.invoke(FeatureBranchProperty.java:247)
at hudson.FilePath.act(FilePath.java:865)
at hudson.FilePath.act(FilePath.java:838)
at jenkins.plugins.svnmerge.FeatureBranchProperty.integrate(FeatureBranchProperty.java:247)
at jenkins.plugins.svnmerge.IntegrateAction.perform(IntegrateAction.java:141)
at jenkins.plugins.svnmerge.IntegrateAction.perform(IntegrateAction.java:130)
at jenkins.plugins.svnmerge.IntegrationPublisher.perform(IntegrationPublisher.java:47)
at hudson.tasks.BuildStepMonitor$2.perform(BuildStepMonitor.java:27)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:810)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:785)
at hudson.model.Build$BuildExecution.post2(Build.java:183)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:732)
at hudson.model.Run.execute(Run.java:1582)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:236)